linux-kernel - Re: [PATCH net-next 1/3] net: phy: Add binding for vendor specific C45 MDIO address space

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Date:   Tue, 17 Apr 2018 11:18:20 -0700
From:   Florian Fainelli <f.fainelli@...il.com>
To:     vicentiu.galanopulo@....com, andrew@...n.ch, robh@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        mark.rutland@....com, davem@...emloft.net, marcel@...tmann.org,
        devicetree@...r.kernel.org
Cc:     alexandru.marginean@....com, madalin.bucur@....com
Subject: Re: [PATCH net-next 1/3] net: phy: Add binding for vendor specific
 C45 MDIO address space

On 04/17/2018 02:02 AM, Vicentiu Galanopulo wrote:
> The extra property enables the discovery on the MDIO bus
> of the PHYs which have a vendor specific address space
> for accessing the C45 MDIO registers.
> 
> Signed-off-by: Vicentiu Galanopulo <vicentiu.galanopulo@....com>
> ---
>  Documentation/devicetree/bindings/net/phy.txt | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
> index d2169a5..82692e2 100644
> --- a/Documentation/devicetree/bindings/net/phy.txt
> +++ b/Documentation/devicetree/bindings/net/phy.txt
> @@ -61,6 +61,11 @@ Optional Properties:
>  - reset-deassert-us: Delay after the reset was deasserted in microseconds.
>    If this property is missing the delay will be skipped.
>  
> +- dev-addr: If set, it indicates the device address of the PHY to be used
> +  when accessing the C45 PHY registers over MDIO. It is used for vendor specific
> +  register space addresses that do no conform to standard address for the MDIO
> +  registers (e.g. MMD30)

Rob made that comment earlier, and I have to ask again now, why don't we
have the Clause 45 PHY binding be modified such that you have a reg
property that has #address-size = 2? This should be entirely backwards
compatible, but it would allow you to specify that device address in a
more traditional way.

> +
>  Example:
>  
>  ethernet-phy@0 {
> @@ -72,4 +77,5 @@ ethernet-phy@0 {
>  	reset-gpios = <&gpio1 4 GPIO_ACTIVE_LOW>;
>  	reset-assert-us = <1000>;
>  	reset-deassert-us = <2000>;
> +	dev-addr = <0x1e>;
>  };
> 


-- 
Florian